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No. 607,|66. Patented July [2, I898. F; G. L. FOGLEB.

SMOKE BURNING FURNACE. (Application filed Nov. 27, 1897.) (No Model.)

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No. 607,166. Patented July l2, I898.

. G. L. FOGLER.

SMBKE BURNING FURNACE.

(Application filed Nov. 27, 1897.)

(No Model.) 2 Sheets-She8t 2.

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UNITED STATES PATENT OFFICE.

GEORGE L. FOGLER, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR OF ONE-HALF TO OTIS D. SIVETT, OF SAME PLACE.

SMOKE-BURNING FURNACE.

SPECIFICATION forming part of Letters Patent No. 607,166, dated July 12, 1898.

A li ati fil d November 27, 1897. Serial No. 659,959. (No model.)

To (LZZ whom it Weary concern:

Be it known that I, GEORGE L. FOGLER, a citizen of the United States, residing at WVashington, in the District of Columbia, have invented certain new and useful Improvements in Smoke-Burning Furnaces; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in smoke and gas burning furnaces, and has for its special object to complete the combustion of fuel of any description. I attain this object by means of the mechanism illustrated in the accompanying drawings, in which Figure 1 is a side elevation of a steamboiler furnace with the near walls removed, showing one form of construction embodying my invention. Fig. 2 is a longitudinal vertical section of the construction shown in Fig. 1. Fig. 3 is a sectional view of the sleeves without the water-jacket. Fig. 4 is a detail view of the secondary draft-box, into which the air-pipes from the outer sleeve and combustion-chamber lead; and Fig. 5 shows detail view of modification of my device.

Like letters of reference denote corresponding parts in the several views of the drawings.

A represents an ordinary fire-box with grate and front construction.

B represents the hollow bridge-Wall, and C the supplementary bridge-wall.

17 represents the inner sleeve attachment to the hollow bridge-wall.

b is the feed-water pipe, leading from the inner sleeve to the boiler.

b shows the preferred form of the inner sleeve at its free end.

0 represents the outer sleeve,-attached to the bridge-wall C and extending beyond the inner sleeve 1). 7

D D are perforations in the bridge-wall C between the outer and inner sleeves. E E are similar perforations outside of outer sleeve.

01 d and e e are pipes leading from the airboxes F F to the perforations D D and E E, respectively.

B is modification of the bridge-wall B, having no water-chamber.

b is a modification of inner sleeve,'having no water-chamber.

0 shows a curved form of the outer sleeve.

The bridge-wall B may be placed .in any position relative to the fire, but so as to be in the way of the draft from the fuel. This wall has a sleeve of a proper size for the gratesurface, projecting away from the bridge-wall in the direction of the draft, covering entirely the opening in the bridge-wall through which the flame, smoke, and gases from the fire all pass. This inner sleeve 1) may be of any suitable shape, but it should preferably converge toward its free end; at least, it should be so constructed as to deliver the flame, smoke, &c., in a compact body, rounded or elliptical or flattened. I do not confine myself to the construction of the bridge -wall to contain water between a double wall nor of the inner sleeve Z) to be a continuation of that construction, being able to obtain as good results in fuel-burning without as with this feature.

The supplementary bridge-wall C, having an opening to receive the inner sleeve Z2, is placed on the side of the bridge-wall B away from the fire and such a distance from it as to permit the inner sleeve 1) or b to project its free end a suitable distance through its tightly-fitting opening. The length of the inner sleeve, the size of the opening in the sup plementary bridge-wall, and the distance between the two bridge-walls B and 0 should be so combined as to conform to each other and meet the requirements of theory and experience. The outer sleeve 0 is fastened securely and tightly to the supplementary bridge-wall C, envelope the inner sleeve 1) centric therewith, and preferably extends beyond the free end of the inner sleeve and converges beyond that end with a slight curve to its open mouth, thus directing the secondary draft,described hereinafter, obliquely against the flame, compacting it into a solid blaze.

The supplementary bridge-Wall C is provided with perforations D D and E E, the

former leading into the space between the two sleeves b and c and the latter into the combastion-chainber.

(Z (Z and c e are air pipcs leading from the holes D D and E E into the draft-regulating boxes F F, having adjustable slides. lhe draft-boxes F F are preferably located within the side wall of the furnace, but may be anywhere, any distance from the boiler, but always leading to the secondary sleeve. I do not confine myself to this manner of conducting the air to the perforations I) D and Id E, being able to dispense with the pipes entirely, but prefer it because of the equal distribution of air to the perforations.

The confined exit from the lire-box makes it very desirable to use the hollow bridge-wall and inner sleeve, into which' the feed-water passes and is heated before being injected into the boiler.

Myinvention may be used with downdraft through the fuel on cookingstoves, airheating furnaces, doc. I do not confine myself to the use of one pair of sleeves, but claim. a multiple construction as well and also more than secom'lary'draft sleeve. It is also pos' sible to dispense with the inner sleeve and even with the supplementary bridge-wall or to construct a bridge-wall having an opening of proper size and shape to receive the smoke and gas within an encompassing draft. If desirable, a fan may be used to force the secondary draft. ()ne pipe inserted loosely into another would be practical to some extent. The vital condition is the keeping of the flame, &c., in one burning mass.

The operation of my device is as follows: A preferably slow the is made to burn in the fire-box and the (lame, smoke, and gases from it pass through the inner sleeve bin one-flame. heating the feed-water which supplies the boiler through the pipe Z) and leaves its free end to enter the outer sleeve 0 and be surrounded by its more swiftly-moving current of fresh air, which, due to the peculiar shape of the interior of the outer sleeve 0, tends to compact and taper the smoke and flame issu ing from the free end of the inner sleeve b,

co nea and as a result the smoke and uneonsumed cannot disseminate without first passing beyond. the fiercely-burning surface at its contact with the secondary draft of fresh air, and the flame will extend beyond the inner sleeve as 'far as necessary to supply every particle of unconsumed smoke and gas with oxygen, accomplishing complete combustion. The secondary draft does not need to envelop the flame, but be directed either from one side or within the flame or in any manner so as to leave no escape for any smoke or gas except through its burning contact with the air.

Having described all that is necessary to a full understanding of my invention, what I claim, and desire to secure by Letters Patent,

1.. A fuel-burning device having a converging sleeve-exit in combination with a secondary sleeve converging from one end to the other and adapted to contain a substantial portion of the primary sleeve within its larger end, leaving a space between the two sleeves for the passage ot' a secondary draft, as shown.

2. A fuel-burning device having a converging sleeveexit partially closed in at its outer end in combination with a secondary sleeve converging from one to the other end and adapted to contain a substantial portion of the primary sleeve within its larger end, leaving a space between the two sleeves for the passage of a secondary draft, as shown.

In a fuel-burning deviee,a hollowbridgewall. having a sleeve, of similar construction, for conducting the flame, smoke, and gases from the ire-box; in combination with a secondary sleeve, extending beyond the primary sleeve so as to receive the flame, smoke, and gases from it, and carrying a draft in the space between the sleeve, substantially as shown.

In testimony whereof I allix my signature in presence of two witnesses.

GEORGE L. FOGLER.

\Vitnesses:

Lou li-OSI'IJXN DENNY, 0151s I). Swn'r'r. 

